Dynamic Recovery solutions Called and told me I owe $6000 from 1995 , Internet

HI got a call from dynamic solutions on 19 October 2012, left a message on my phone. Called them back and the lady on the phone and said that I owed a $6000 dollar bill for well Fargo. I proceeded to tell her I don't have any debt to Wells Fargo and never have. She proceeded to tell me that I owe this money from 1995. I again told her never had Wells Fargo . she said she wasn't going to argue she was putting me down as refusal to pay. I have never gotten a letter from these people just a phone call nor had she offered me any information at all to verify that she would send me any proof that I owed this debt. The number that called me was 937-329-9939. Could not find a address locally, which is Dayton Ohio. Have checked my credit report and they were not on my report at all.